Salivary gland diseases Flashcards
How do you examine salivary glands? (2)
- Visually - front, side and behind pt
- Palpate
Which nervous pathway increases salivary flow?
Which decreases salivary flow?
Incr = Parasympathetic - cholinergic
Decr = Sympathetic - adrenergic
What CN innervates submandibular and sublingual gland? Incr salivary flow?
CN7 - facial nerve, chorda tympani
What CN innervates parotid gland? Incr salivary flow?
CN9, glossopharyngeal - lesser petrosal nerve
What CN innervates minor salivary glands? Incr salivary flow?
Both CN7 and CN9 - facial nerve and glossopharyngeal
How does the sympathetic, adrenergic pathway work? To decr salivary flow? (5)
- Sympathetic outflow
- Cervical ganglia
- Plexus along artery walls
- Branches to CNs
- Innervates salivary glands
What does saliva contain?
99.4% water
0.6% minerals and proteins
- Inorganic = sodium, potassium, chloride, bicarbonate, hydrogen, iodine, fluoride, calcium phosphate
- Organic = urea, uric acid, AAs, glucose, lactate, fatty acids
- Macromolecules = serum proteins, glycoproteins, peroxidases, amylase, lysozymes, IgA, IgG, IgM
What is the flow rate of saliva stimulated and non stimulated?
Stimulated = 4 - 5 ml/min
Non stimulated = 0.3 - 0.4 ml/min
How can you investigate salivary gland disease? (7)
- Sialomertry
- Oral rinse
- Plain film radiography
- Ultrasound
- Bloods
- MRI
- Biopsy
How is Sialometry used?
- Measure of saliva produced ml/min over 5-10mins
- Crude technique, not used in practice
How is plain film radiography used?
- Identifies radio opaque calculus
- Needs 2 radiographs at 90 degrees to each other
How is Ultrasound used?
- High freq sound waves can identify solid lesions incl. tumours / calculus / cysts
- Not good for assessing salivary gland function
How is Sialography used?
- Retrograde sialography examines ductal system using radio iodide
- Shows structures, filling defects
- Not good for investigating salivary tumours
How are bloods used?
- Venous blood sample for xerostomia pt
- Sjogren’s screen involves - FBC, liver function tests, urea, electrolytes, HbA1C (glucose test), serum immunoglobulins, hep C and HIV serology
What is Sjogren’s syndrome?
- Autoimmune disease affecting exocrine glands
- Effects moisture production
How is MRI used?
- Magnetic Resonance Imaging
- Demonstrates soft tissue detail
- Ideal to see tumour extent and relation to normal anatomy
How are biopsies used?
Excisional for minor SGs - done IO
Incisional for major SGs - done IO / EO
What are symptoms of salivary gland diseases?
- Swellings - localised / generalised / uni / bi-lateral / persistent / transient
- Pain
- Discharge from SG duct
- Xerostomia / Sialorrhoea
What are the 11 salivary gland diseases need to know?
- Obstructive
- Xerostomia
- Sialorrhoea
- Sarcoidoisis / HIV related SG disease
- Cancers
- Benign neoplasias
- Benign cysts
- Acute / chronic sialadenitis
- Frey’s syndrome
- Developmental abnormalities
- Primary / secondary Sjogren’s syndrome
What are main causes of obstructive SG disease?
- Calculi
- Strictures (narrowing of duct)
- Infections
Define sialadenitis?
How is it categorised?
Inflammation of salivary gland
Infective
Obstructive
What else may cause obstructions of salivary glands?
- Local swellings e.g. from cancers / lymph nodes
Describe salivary gland calculi
- AKA Sialoliths
- Most common cause of obstructive sialadenitis
- Usually major salivary glands
- Hard
- Single / multiple
- 80% involve submandibular gland
- Can be asymptomatic
What causes strictures?
Trauma to the duct followed by fibrosis
Nearly all acquired